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I have checked in the information of your Yonex Ti10 shaft Serial:6245943; Cone Date Code200668IP (date=20 Jun 2006) to my information list of Yonex rackets made in Japan, its serial no. and date code are legitimate.

However you still need to inspect the other physical features of the racket carefully and compare the specifications to ascertain its total legitimacy or authenticity yourself.

Yonex launched Nanospeed S or X in early Jan 2006 starting the serial no. of 5894000 onwards.
The serial no. of 5334032 didi not match with the date code of 250768SP (date=25 Jul 2006). For the date code of 250768SP (date=25 Jul 2006), the serial no should be close to 6313400.
IMHO your Yonex NS 9000S of serial no.of 5334032 and date code of 250768SP is a fake.

I have checked in the information of your Yonex Nanospeed 9000X shaft Serial:7075734; Cone Date Code:170873US (date=17 Aug 2007) to my information list of Yonex rackets made in Japan, its serial no. and date code are legitimate.

However you still need to inspect the other physical features of the racket carefully and compare the specifications to ascertain its total legitimacy or authenticity yourself.

I have checked in the information of your Yonex Nanospeed 9000X shaft Serial:7075734; Cone Date Code:170873US (date=17 Aug 2007) to my information list of Yonex rackets made in Japan, its serial no. and date code are legitimate.

However you still need to inspect the other physical features of the racket carefully and compare the specifications to ascertain its total legitimacy or authenticity yourself.

Thank you leehsim.

I was excited when I bought it today. I am content now that it is indeed genuine. I did my check today and I compared it with another NS9000X at local badminton club. If anybody lives in South Bay San Jose, CA USA area and is interested in NS9000X and S, etc, the guy's name that I bought mine from is Chris and his liquidation ads is here : http://sfbay.craigslist.org/sby/spo/469560391.html
He can be reached at gs_sportsstore@hotmail.com (Golden State Sports Store)

I have checked in the information of your Yonex NS-9000X shaft Serial:5934675; Cone Date Code:270162SP (date=27 Jan 2006) to my information list of Yonex rackets made in Japan, its serial no. and date code are legitimate.

However you still need to inspect the other physical features of the racket carefully and compare the specifications to ascertain its total legitimacy or authenticity yourself.

I have checked in the information of your Yonex Armortec 900 Power shaft Serial:7008999; Cone Date Code:090772SP (date=09 Jul 2007) to my information list of Yonex rackets made in Japan, its serial no. and date code are legitimate.

However you still need to inspect the other physical features of the racket carefully and compare the specifications to ascertain its total legitimacy or authenticity yourself.